Allow integrations to define trigger platforms with a subtype (#54861)

homeassistant/helpers/trigger.py

@@ -21,7 +21,8 @@ _PLATFORM_ALIASES = {
 
 
 async def _async_get_trigger_platform(hass: HomeAssistant, config: ConfigType) -> Any:
-    platform = config[CONF_PLATFORM]
+    platform_and_sub_type = config[CONF_PLATFORM].split(".")
+    platform = platform_and_sub_type[0]
     for alias, triggers in _PLATFORM_ALIASES.items():
         if platform in triggers:
             platform = alias

tests/helpers/test_trigger.py

 """The tests for the trigger helper."""
+from unittest.mock import MagicMock, call, patch
+
 import pytest
 import voluptuous as vol
 
-from homeassistant.helpers.trigger import async_validate_trigger_config
+from homeassistant.helpers.trigger import (
+    _async_get_trigger_platform,
+    async_validate_trigger_config,
+)
 
 
 async def test_bad_trigger_platform(hass):
@@ -10,3 +15,12 @@ async def test_bad_trigger_platform(hass):
     with pytest.raises(vol.Invalid) as ex:
         await async_validate_trigger_config(hass, [{"platform": "not_a_platform"}])
     assert "Invalid platform 'not_a_platform' specified" in str(ex)
+
+
+async def test_trigger_subtype(hass):
+    """Test trigger subtypes."""
+    with patch(
+        "homeassistant.helpers.trigger.async_get_integration", return_value=MagicMock()
+    ) as integration_mock:
+        await _async_get_trigger_platform(hass, {"platform": "test.subtype"})
+        assert integration_mock.call_args == call(hass, "test")